video: fbdev: msm: Add support for ultra low power state

During static display if the DSI lanes are in ULPS mode,
the load on the panel regulators can be lowered. Configure
power modules in optimum mode during this state.

Change-Id: Ie34b7926ea715400fa150040e5bb3f7be2d96f50
Signed-off-by: Venkata Prahlad Valluru <vvalluru@codeaurora.org>